<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>3.自定义指令以及ESlint | 星月前端博客</title>
    <meta name="generator" content="VuePress 1.8.2">
    <link rel="icon" href="/favicon.ico">
    <meta name="description" content="The top of the mountain is not the end, nor is the other mountain.">
    <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no">
    
    <link rel="preload" href="/assets/css/0.styles.f057962c.css" as="style"><link rel="preload" href="/assets/js/app.b0d6e6c9.js" as="script"><link rel="preload" href="/assets/js/3.3f705cf6.js" as="script"><link rel="preload" href="/assets/js/1.5432b32a.js" as="script"><link rel="preload" href="/assets/js/57.a5fde1bb.js" as="script"><link rel="prefetch" href="/assets/js/10.a8f43ca8.js"><link rel="prefetch" href="/assets/js/11.f3a618ea.js"><link rel="prefetch" href="/assets/js/12.b0d83b4c.js"><link rel="prefetch" href="/assets/js/13.f1fb4696.js"><link rel="prefetch" href="/assets/js/14.e5bc98a2.js"><link rel="prefetch" href="/assets/js/15.50519e37.js"><link rel="prefetch" href="/assets/js/16.3c6a720c.js"><link rel="prefetch" href="/assets/js/17.39fb3a22.js"><link rel="prefetch" href="/assets/js/18.76eb3752.js"><link rel="prefetch" href="/assets/js/19.7e9cf824.js"><link rel="prefetch" href="/assets/js/20.91bdeca4.js"><link rel="prefetch" href="/assets/js/21.136cc362.js"><link rel="prefetch" href="/assets/js/22.ec4f40f8.js"><link rel="prefetch" href="/assets/js/23.50127d3e.js"><link rel="prefetch" href="/assets/js/24.793b4c66.js"><link rel="prefetch" href="/assets/js/25.e2402b1b.js"><link rel="prefetch" href="/assets/js/26.cda4008e.js"><link rel="prefetch" href="/assets/js/27.8f1f302e.js"><link rel="prefetch" href="/assets/js/28.15cd65f2.js"><link rel="prefetch" href="/assets/js/29.00adce9e.js"><link rel="prefetch" href="/assets/js/30.c29d2b5d.js"><link rel="prefetch" href="/assets/js/31.40db97f7.js"><link rel="prefetch" href="/assets/js/32.70ed39cf.js"><link rel="prefetch" href="/assets/js/33.b0f7cfc3.js"><link rel="prefetch" href="/assets/js/34.f0a63370.js"><link rel="prefetch" href="/assets/js/35.88e20dad.js"><link rel="prefetch" href="/assets/js/36.13f74559.js"><link rel="prefetch" href="/assets/js/37.1d442fc4.js"><link rel="prefetch" href="/assets/js/38.84077197.js"><link rel="prefetch" href="/assets/js/39.51512938.js"><link rel="prefetch" href="/assets/js/4.3ce47df9.js"><link rel="prefetch" href="/assets/js/40.1f3d0e52.js"><link rel="prefetch" href="/assets/js/41.8e4ee580.js"><link rel="prefetch" href="/assets/js/42.690cbafe.js"><link rel="prefetch" href="/assets/js/43.c4aa2221.js"><link rel="prefetch" href="/assets/js/44.fb378084.js"><link rel="prefetch" href="/assets/js/45.77700693.js"><link rel="prefetch" href="/assets/js/46.d507cb48.js"><link rel="prefetch" href="/assets/js/47.e3a1008a.js"><link rel="prefetch" href="/assets/js/48.d6c9c78e.js"><link rel="prefetch" href="/assets/js/49.4667e7c0.js"><link rel="prefetch" href="/assets/js/5.6d641d4f.js"><link rel="prefetch" href="/assets/js/50.8ec4f4f5.js"><link rel="prefetch" href="/assets/js/51.d9305c51.js"><link rel="prefetch" href="/assets/js/52.db11222b.js"><link rel="prefetch" href="/assets/js/53.61d62d9d.js"><link rel="prefetch" href="/assets/js/54.f20b6c65.js"><link rel="prefetch" href="/assets/js/55.0a4f147e.js"><link rel="prefetch" href="/assets/js/56.cd32d35a.js"><link rel="prefetch" href="/assets/js/58.a0a97490.js"><link rel="prefetch" href="/assets/js/59.1bb4fab1.js"><link rel="prefetch" href="/assets/js/6.5f336290.js"><link rel="prefetch" href="/assets/js/60.e6987c2a.js"><link rel="prefetch" href="/assets/js/61.419fcdc8.js"><link rel="prefetch" href="/assets/js/62.5a9d4e12.js"><link rel="prefetch" href="/assets/js/63.be6ca5ce.js"><link rel="prefetch" href="/assets/js/64.8aef8f94.js"><link rel="prefetch" href="/assets/js/65.16450833.js"><link rel="prefetch" href="/assets/js/66.2969e029.js"><link rel="prefetch" href="/assets/js/67.e3a3c472.js"><link rel="prefetch" href="/assets/js/68.6ff65261.js"><link rel="prefetch" href="/assets/js/69.cf4da88b.js"><link rel="prefetch" href="/assets/js/7.6a1d4e29.js"><link rel="prefetch" href="/assets/js/70.1472620a.js"><link rel="prefetch" href="/assets/js/71.1e7cb0a1.js"><link rel="prefetch" href="/assets/js/72.2bf85313.js"><link rel="prefetch" href="/assets/js/73.d9cb4d96.js"><link rel="prefetch" href="/assets/js/74.0c536977.js"><link rel="prefetch" href="/assets/js/75.4f82c6a8.js"><link rel="prefetch" href="/assets/js/76.42f3f0b7.js"><link rel="prefetch" href="/assets/js/77.70961c41.js"><link rel="prefetch" href="/assets/js/78.2f45f2fc.js"><link rel="prefetch" href="/assets/js/79.a68a9b1c.js"><link rel="prefetch" href="/assets/js/8.378e22b1.js"><link rel="prefetch" href="/assets/js/80.6cb339b8.js"><link rel="prefetch" href="/assets/js/81.5849f124.js"><link rel="prefetch" href="/assets/js/82.f5531d2d.js"><link rel="prefetch" href="/assets/js/83.47badffa.js"><link rel="prefetch" href="/assets/js/84.dece7e94.js"><link rel="prefetch" href="/assets/js/85.d9e7f122.js"><link rel="prefetch" href="/assets/js/86.233d7088.js"><link rel="prefetch" href="/assets/js/87.ce5dff2e.js"><link rel="prefetch" href="/assets/js/88.f976bef7.js"><link rel="prefetch" href="/assets/js/89.8473e540.js"><link rel="prefetch" href="/assets/js/9.9eb4a88c.js"><link rel="prefetch" href="/assets/js/90.d6288b36.js"><link rel="prefetch" href="/assets/js/91.989f4dea.js"><link rel="prefetch" href="/assets/js/92.6ff507f9.js">
    <link rel="stylesheet" href="/assets/css/0.styles.f057962c.css">
  </head>
  <body>
    <div id="app" data-server-rendered="true"><div class="theme-container no-sidebar" data-v-5bb33761><div data-v-5bb33761><div class="password-shadow password-wrapper-out" style="display:none;" data-v-59e6cb88 data-v-5bb33761 data-v-5bb33761><h3 class="title" data-v-59e6cb88>星月前端博客</h3> <p class="description" data-v-59e6cb88>The top of the mountain is not the end, nor is the other mountain.</p> <label id="box" class="inputBox" data-v-59e6cb88><input type="password" value="" data-v-59e6cb88> <span data-v-59e6cb88>Konck! Knock!</span> <button data-v-59e6cb88>OK</button></label> <div class="footer" data-v-59e6cb88><span data-v-59e6cb88><i class="iconfont reco-theme" data-v-59e6cb88></i> <a target="blank" href="https://vuepress-theme-reco.recoluan.com" data-v-59e6cb88>vuePress-theme-reco</a></span> <span data-v-59e6cb88><i class="iconfont reco-copyright" data-v-59e6cb88></i> <a data-v-59e6cb88><span data-v-59e6cb88>星月</span>
          
        <!---->
        2022
      </a></span></div></div> <div class="hide" data-v-5bb33761><header class="navbar" data-v-5bb33761><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="/logo.png" alt="星月前端博客" class="logo"> <span class="site-name">星月前端博客</span></a> <div class="links"><div class="color-picker"><a class="color-button"><i class="iconfont reco-color"></i></a> <div class="color-picker-menu" style="display:none;"><div class="mode-options"><h4 class="title">Choose mode</h4> <ul class="color-mode-options"><li class="dark">dark</li><li class="auto active">auto</li><li class="light">light</li></ul></div></div></div> <div class="search-box"><i class="iconfont reco-search"></i> <input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><a href="/" class="nav-link"><i class="iconfont reco-home"></i>
  首页
</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title"><i class="iconfont reco-category"></i>
      博客
    </span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/categories/ES6模块化与异步编程/" class="nav-link"><i class="undefined"></i>
  ES6模块化与异步编程
</a></li><li class="dropdown-item"><!----> <a href="/categories/css/" class="nav-link"><i class="undefined"></i>
  css
</a></li><li class="dropdown-item"><!----> <a href="/categories/TypeScript/" class="nav-link"><i class="undefined"></i>
  TypeScript
</a></li><li class="dropdown-item"><!----> <a href="/categories/html/" class="nav-link"><i class="undefined"></i>
  html
</a></li><li class="dropdown-item"><!----> <a href="/categories/JavaScript/" class="nav-link"><i class="undefined"></i>
  JavaScript
</a></li><li class="dropdown-item"><!----> <a href="/categories/Node.js/" class="nav-link"><i class="undefined"></i>
  Node.js
</a></li><li class="dropdown-item"><!----> <a href="/categories/Vue2/" class="nav-link"><i class="undefined"></i>
  Vue2
</a></li><li class="dropdown-item"><!----> <a href="/categories/Vue3/" class="nav-link"><i class="undefined"></i>
  Vue3
</a></li><li class="dropdown-item"><!----> <a href="/categories/webpack/" class="nav-link"><i class="undefined"></i>
  webpack
</a></li></ul></div></div><div class="nav-item"><a href="/tag/" class="nav-link"><i class="iconfont reco-tag"></i>
  标签
</a></div><div class="nav-item"><a href="/timeline/" class="nav-link"><i class="iconfont reco-date"></i>
  时间线
</a></div><div class="nav-item"><a href="/docs/theme-reco/" class="nav-link"><i class="iconfont reco-message"></i>
  随记
</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title"><i class="iconfont reco-message"></i>
      联系方式
    </span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://github.com/858399075" target="_blank" rel="noopener noreferrer" class="nav-link external"><i class="iconfont reco-github"></i>
  GitHub
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li><li class="dropdown-item"><!----> <a href="https://gitee.com/xingyueqianduan" target="_blank" rel="noopener noreferrer" class="nav-link external"><i class="iconfont reco-github"></i>
  Gitee
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li><li class="dropdown-item"><!----> <a href="http://blog.yhxweb.top/" target="_blank" rel="noopener noreferrer" class="nav-link external"><i></i>
  QQ:76120220
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li><li class="dropdown-item"><!----> <a href="http://blog.yhxweb.top/" target="_blank" rel="noopener noreferrer" class="nav-link external"><i></i>
  WX:15237156071
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li></ul></div></div> <!----></nav></div></header> <div class="sidebar-mask" data-v-5bb33761></div> <aside class="sidebar" data-v-5bb33761><div class="personal-info-wrapper" data-v-1fad0c41 data-v-5bb33761><img src="/avatar.png" alt="author-avatar" class="personal-img" data-v-1fad0c41> <h3 class="name" data-v-1fad0c41>
    星月
  </h3> <div class="num" data-v-1fad0c41><div data-v-1fad0c41><h3 data-v-1fad0c41>82</h3> <h6 data-v-1fad0c41>Articles</h6></div> <div data-v-1fad0c41><h3 data-v-1fad0c41>9</h3> <h6 data-v-1fad0c41>Tags</h6></div></div> <ul class="social-links" data-v-1fad0c41></ul> <hr data-v-1fad0c41></div> <nav class="nav-links"><div class="nav-item"><a href="/" class="nav-link"><i class="iconfont reco-home"></i>
  首页
</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title"><i class="iconfont reco-category"></i>
      博客
    </span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/categories/ES6模块化与异步编程/" class="nav-link"><i class="undefined"></i>
  ES6模块化与异步编程
</a></li><li class="dropdown-item"><!----> <a href="/categories/css/" class="nav-link"><i class="undefined"></i>
  css
</a></li><li class="dropdown-item"><!----> <a href="/categories/TypeScript/" class="nav-link"><i class="undefined"></i>
  TypeScript
</a></li><li class="dropdown-item"><!----> <a href="/categories/html/" class="nav-link"><i class="undefined"></i>
  html
</a></li><li class="dropdown-item"><!----> <a href="/categories/JavaScript/" class="nav-link"><i class="undefined"></i>
  JavaScript
</a></li><li class="dropdown-item"><!----> <a href="/categories/Node.js/" class="nav-link"><i class="undefined"></i>
  Node.js
</a></li><li class="dropdown-item"><!----> <a href="/categories/Vue2/" class="nav-link"><i class="undefined"></i>
  Vue2
</a></li><li class="dropdown-item"><!----> <a href="/categories/Vue3/" class="nav-link"><i class="undefined"></i>
  Vue3
</a></li><li class="dropdown-item"><!----> <a href="/categories/webpack/" class="nav-link"><i class="undefined"></i>
  webpack
</a></li></ul></div></div><div class="nav-item"><a href="/tag/" class="nav-link"><i class="iconfont reco-tag"></i>
  标签
</a></div><div class="nav-item"><a href="/timeline/" class="nav-link"><i class="iconfont reco-date"></i>
  时间线
</a></div><div class="nav-item"><a href="/docs/theme-reco/" class="nav-link"><i class="iconfont reco-message"></i>
  随记
</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title"><i class="iconfont reco-message"></i>
      联系方式
    </span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://github.com/858399075" target="_blank" rel="noopener noreferrer" class="nav-link external"><i class="iconfont reco-github"></i>
  GitHub
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li><li class="dropdown-item"><!----> <a href="https://gitee.com/xingyueqianduan" target="_blank" rel="noopener noreferrer" class="nav-link external"><i class="iconfont reco-github"></i>
  Gitee
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li><li class="dropdown-item"><!----> <a href="http://blog.yhxweb.top/" target="_blank" rel="noopener noreferrer" class="nav-link external"><i></i>
  QQ:76120220
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li><li class="dropdown-item"><!----> <a href="http://blog.yhxweb.top/" target="_blank" rel="noopener noreferrer" class="nav-link external"><i></i>
  WX:15237156071
  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li></ul></div></div> <!----></nav> <!----> </aside> <div class="password-shadow password-wrapper-in" style="display:none;" data-v-59e6cb88 data-v-5bb33761><h3 class="title" data-v-59e6cb88>3.自定义指令以及ESlint</h3> <!----> <label id="box" class="inputBox" data-v-59e6cb88><input type="password" value="" data-v-59e6cb88> <span data-v-59e6cb88>Konck! Knock!</span> <button data-v-59e6cb88>OK</button></label> <div class="footer" data-v-59e6cb88><span data-v-59e6cb88><i class="iconfont reco-theme" data-v-59e6cb88></i> <a target="blank" href="https://vuepress-theme-reco.recoluan.com" data-v-59e6cb88>vuePress-theme-reco</a></span> <span data-v-59e6cb88><i class="iconfont reco-copyright" data-v-59e6cb88></i> <a data-v-59e6cb88><span data-v-59e6cb88>星月</span>
          
        <!---->
        2022
      </a></span></div></div> <div data-v-5bb33761><div data-v-5bb33761><main class="page" style="padding-right:0;"><section style="display:;"><div class="page-title"><h1 class="title">3.自定义指令以及ESlint</h1> <div data-v-8a445198><i class="iconfont reco-account" data-v-8a445198><span data-v-8a445198>星月</span></i> <i class="iconfont reco-date" data-v-8a445198><span data-v-8a445198>7/24/2022</span></i> <!----> <i class="tags iconfont reco-tag" data-v-8a445198><span class="tag-item" data-v-8a445198>vue</span></i></div></div> <div class="theme-reco-content content__default"><h1 id="_3-自定义指令"><a href="#_3-自定义指令" class="header-anchor">#</a> 3 自定义指令</h1> <h4 id="_3-1-自定义指令的分类"><a href="#_3-1-自定义指令的分类" class="header-anchor">#</a> 3.1 自定义指令的分类</h4> <p>vue中的自定义指令分为两类，分别是：</p> <ul><li>私有自定义指令</li> <li>全局自定义指令</li></ul> <h5 id="_3-1-1-私有自定义指令"><a href="#_3-1-1-私有自定义指令" class="header-anchor">#</a> 3.1.1 私有自定义指令</h5> <p>在每个vue组件中，可以在directives节点下声明私有自定义指令。示例代码如下：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token operator">&lt;</span>h1 v<span class="token operator">-</span>color<span class="token operator">=</span><span class="token string">&quot;color&quot;</span><span class="token operator">&gt;</span>App 根组件<span class="token operator">&lt;</span><span class="token operator">/</span>h1<span class="token operator">&gt;</span>


<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
	<span class="token comment">// 私有自定义指令的节点</span>
  <span class="token literal-property property">directives</span><span class="token operator">:</span> <span class="token punctuation">{</span>

    <span class="token comment">// 定义名为 color 的指令，指向一个配置对象</span>
    <span class="token comment">/* color: {
      // 当指令第一次被绑定到元素上的时候，会立即触发 bind 函数
      // 形参中的 el 表示当前指令所绑定到的那个 DOM 对象
      bind(el, binding) {
        console.log('触发了 v-color 的 bind 函数')
        el.style.color = binding.value
      },
      // 在 DOM 更新的时候，会触发 update 函数
      update(el, binding) {
        console.log('触发了 v-color 的 update 函数')
        el.style.color = binding.value
      }
    } */</span>

    <span class="token function">color</span><span class="token punctuation">(</span><span class="token parameter">el<span class="token punctuation">,</span> binding</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      el<span class="token punctuation">.</span>style<span class="token punctuation">.</span>color <span class="token operator">=</span> binding<span class="token punctuation">.</span>value
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br></div></div><h5 id="_3-1-2-全局自定义指令"><a href="#_3-1-2-全局自定义指令" class="header-anchor">#</a> 3.1.2 全局自定义指令</h5> <ul><li>全局共享的自定义指令需要通过 “Vue.directive()” 进行声明，示例代码如下：</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code>Vue<span class="token punctuation">.</span><span class="token function">directive</span><span class="token punctuation">(</span><span class="token string">'color'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">el<span class="token punctuation">,</span>binding</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
	el<span class="token punctuation">.</span>style<span class="token punctuation">.</span>color <span class="token operator">=</span> binding<span class="token punctuation">.</span>value
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span> 全局自定义指令，定义以后可以在项目的任何地方使用这个v<span class="token operator">-</span>color，有点和过滤器类似！
    Vue<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span><span class="token string">'过滤器名字'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        cosole<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'这里是过滤器的执行函数！'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token operator">--</span><span class="token operator">&gt;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><h5 id="_3-1-3-eslint-代码检查工具"><a href="#_3-1-3-eslint-代码检查工具" class="header-anchor">#</a> 3.1.3 ESLint 代码检查工具</h5> <h6 id="关于"><a href="#关于" class="header-anchor">#</a> 关于</h6> <blockquote><p>ESLint 是一个开源的 JavaScript 代码检查工具，由 Nicholas C. Zakas 于2013年6月创建。代码检查是一种静态的分析，常用于寻找有问题的模式或者代码，并且不依赖于具体的编码风格。对大多数编程语言来说都会有代码检查，一般来说编译程序会内置检查工具。</p> <p>JavaScript 是一个动态的弱类型语言，在开发中比较容易出错。因为没有编译程序，为了寻找 JavaScript 代码错误通常需要在执行过程中不断调试。像 ESLint 这样的可以让程序员在编码的过程中发现问题而不是在执行的过程中。</p> <p>ESLint 的初衷是为了让程序员可以创建自己的检测规则。ESLint 的所有规则都被设计成可插入的。ESLint 的默认规则与其他的插件并没有什么区别，规则本身和测试可以依赖于同样的模式。为了便于人们使用，ESLint 内置了一些规则，当然，你可以在使用过程中自定义规则。</p> <p>ESLint 使用 Node.js 编写，这样既可以有一个快速的运行环境的同时也便于安装。</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token literal-property property">ESLink文档官网：https</span><span class="token operator">:</span><span class="token operator">/</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">eslint.bootcss.com</span><span class="token regex-delimiter">/</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div></blockquote> <p><em>说白了就是在团队开发中约束每个开发人员的代码规范，比如：代码换行是4个空格还是2个空格等等。比如规范化2个空格为换行，你在代码中写了4个空格就会报错提示你。</em></p> <blockquote><p>在vscod中设置代码规范的方法：</p> <ol><li><p>管理（小齿轮）、设置、搜索[tabsize]，这里就是改了代码换行的空格数字</p> <p><img src="C:/Users/85839/AppData/Roaming/Typora/typora-user-images/image-20220720210738278.png" alt="image-20220720210738278"></p> <p>2.搜索format ，这里也要打勾（默认就是勾上的）</p> <p><img src="C:/Users/85839/AppData/Roaming/Typora/typora-user-images/image-20220720210950818.png" alt="image-20220720210950818"></p></li></ol></blockquote> <h6 id="使用"><a href="#使用" class="header-anchor">#</a> 使用</h6> <p><strong>下面创建一个全新的vue-cli来使用ESLint，手动安装带ESLint的vue-cli项目</strong></p> <p><strong>步骤如下：</strong></p> <p>步骤1</p> <p><img src="https://img-blog.csdnimg.cn/78fa3c44e0364c2d9d6453e55afb095f.png" alt="image-20220720211625032"></p> <p>步骤2</p> <p><img src="https://img-blog.csdnimg.cn/0d5b7696dbec41be944642a0c2c23ed4.png" alt="image-20220720211744136"></p> <p>步骤3</p> <p><img src="https://img-blog.csdnimg.cn/f96c591808b54ae3a9c7ba2c7af33ab8.png" alt="image-20220720211955850"></p> <p>步骤4</p> <p><img src="https://img-blog.csdnimg.cn/a8a7e19e2fd7459b88971a8f71754e00.png" alt="image-20220720212053843"></p> <p>步骤5</p> <p><img src="https://img-blog.csdnimg.cn/e686d9a966d0463c9d2408892bd0667d.png" alt="image-20220720212139256"></p> <p>步骤6</p> <p><img src="https://img-blog.csdnimg.cn/c5cb402a8b02494cac8eb81d606b4077.png" alt="image-20220720212319763"></p> <p>步骤7</p> <p><img src="https://img-blog.csdnimg.cn/0afaf846ed454274808bffe282f523e9.png" alt="image-20220720212542566"></p> <p>步骤8</p> <p><img src="https://img-blog.csdnimg.cn/235ed3c193f64818a68224c6442aee90.png" alt="image-20220720212858144"></p> <p>步骤9</p> <p><img src="https://img-blog.csdnimg.cn/995150d3de89469c85f03ceae10504fe.png" alt="image-20220720213035017"></p> <p>安装项目中</p> <p><strong>安装过程中最好不好切窗口，耐心等待。</strong></p> <p><img src="https://img-blog.csdnimg.cn/ad9d7dfb42db476f82a0732a390f2a7a.png" alt="image-20220720213114953"></p> <p>这样就安装完成了</p> <p><img src="https://img-blog.csdnimg.cn/b44706c40f88421ab1820e376d24201b.png" alt="image-20220720213247361"></p> <p>作者：星月</p> <p>个人博客：<a href="https://xingyue.vercel.app/" target="_blank" rel="noopener noreferrer">星月前端个人博客<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></p> <p><img src="https://img-blog.csdnimg.cn/6311c9b116e149d096660e88c801f095.png" alt="image-20220720213247361"></p> <ul><li>到这里带ESLint的vue2.0项目就安装好了。</li> <li>在项目首页会有一个名字为.eslintrc.js的配置文件.</li> <li>当我们在开发中，规范错误了的话，解决方法：</li> <li>（1）去ESLint官方文档搜这个错误，如图</li> <li><img src="https://img-blog.csdnimg.cn/af3fff5b0f8e4591bb08e1ae6f7e3973.png" alt="image-20220720231139522"></li></ul> <p><img src="https://img-blog.csdnimg.cn/ca60f5260d1e482892ed297b3af1d5a6.png" alt="image-20220720231301482"></p> <p><strong>会了这些肯定是不行的，开发效率太低了，我们在vscod上安装一些插件来辅助开发，自动调整代码格式：</strong></p> <blockquote><p>1.ESLint (作者：Dirk Baeumer)</p> <p>安装好了需要加一点配置文件。vscod、小齿轮、设置、右上角差分页面旁边的一个（打开设置，），打开后是vscod的settings.json文件。然后在顶部添加下面的代码：</p> <p><em>//ESlint 插件的配置</em></p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token string-property property">&quot;editor.codeActionsOnSave&quot;</span><span class="token operator">:</span><span class="token punctuation">{</span>

  <span class="token string-property property">&quot;source.fixAll&quot;</span><span class="token operator">:</span><span class="token boolean">true</span><span class="token punctuation">,</span>

<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div></blockquote> <blockquote><p>2.prettier - Code formatter (作者：prettier)</p> <p>安装后也是在项目的根目录下新建一个文件  .prettierrc.js 在文件里面放入下面的代码：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code>module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token comment">// 使用 2 个空格缩进</span>
<span class="token literal-property property">tabWidth</span><span class="token operator">:</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token comment">// 不使用缩进符，而使用空格</span>
<span class="token literal-property property">useTabs</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token comment">// 行尾需要有分号</span>
<span class="token literal-property property">semi</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token comment">// 使用单引号</span>
<span class="token literal-property property">singleQuote</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token comment">// 对象的 key 仅在必要时用引号</span>
<span class="token literal-property property">quoteProps</span><span class="token operator">:</span> <span class="token string">'as-needed'</span><span class="token punctuation">,</span>
<span class="token comment">// jsx 不使用单引号，而使用双引号</span>
<span class="token literal-property property">jsxSingleQuote</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token comment">// 末尾不需要逗号</span>
<span class="token literal-property property">trailingComma</span><span class="token operator">:</span> <span class="token string">'none'</span><span class="token punctuation">,</span>
<span class="token comment">// 大括号内的首尾需要空格</span>
<span class="token literal-property property">bracketSpacing</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token comment">// jsx 标签的反尖括号需要换行</span>
<span class="token literal-property property">jsxBracketSameLine</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token comment">// 箭头函数，只有一个参数的时候，也需要括号</span>
<span class="token literal-property property">arrowParens</span><span class="token operator">:</span> <span class="token string">'always'</span><span class="token punctuation">,</span>
<span class="token comment">// 每个文件格式化的范围是文件的全部内容</span>
<span class="token literal-property property">rangeStart</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token literal-property property">rangeEnd</span><span class="token operator">:</span> <span class="token number">Infinity</span><span class="token punctuation">,</span>
<span class="token comment">// 不需要写文件开头的 @prettier</span>
<span class="token literal-property property">requirePragma</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token comment">// 不需要自动在文件开头插入 @prettier</span>
<span class="token literal-property property">insertPragma</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token comment">// 使用默认的折行标准</span>
<span class="token literal-property property">proseWrap</span><span class="token operator">:</span> <span class="token string">'preserve'</span><span class="token punctuation">,</span>
<span class="token comment">// 根据显示样式决定 html 要不要折行</span>
<span class="token literal-property property">htmlWhitespaceSensitivity</span><span class="token operator">:</span> <span class="token string">'css'</span><span class="token punctuation">,</span>
<span class="token comment">// 换行符使用 lf</span>
<span class="token literal-property property">endOfLine</span><span class="token operator">:</span> <span class="token string">'lf'</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br></div></div></blockquote> <blockquote><p><strong>现在你就可以使用 alt+shift+f 组合键来快速格式化你在VS Code中的代码了。</strong></p> <p>如果你有其他插件，格式化文档的默认不是 prettier - Code formatter ，那么在项目中 右键鼠标、设置格式化文档的方式、选到prettier就好了。</p></blockquote></div></section> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated: </span> <span class="time">8/15/2022, 10:36:03 PM</span></div></footer> <!----> <div class="comments-wrapper"><!----></div> <ul class="side-bar sub-sidebar-wrapper" style="width:0;" data-v-ac050c62></ul></main></div> <!----></div></div></div></div><div class="global-ui"><div class="back-to-ceiling" style="right:1rem;bottom:6rem;width:2.5rem;height:2.5rem;border-radius:.25rem;line-height:2.5rem;display:none;" data-v-c6073ba8 data-v-c6073ba8><svg t="1574745035067" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5404" class="icon" data-v-c6073ba8><path d="M526.60727968 10.90185116a27.675 27.675 0 0 0-29.21455937 0c-131.36607665 82.28402758-218.69155461 228.01873535-218.69155402 394.07834331a462.20625001 462.20625001 0 0 0 5.36959153 69.94390903c1.00431239 6.55289093-0.34802892 13.13561351-3.76865779 18.80351572-32.63518765 54.11355614-51.75690182 118.55860487-51.7569018 187.94566865a371.06718723 371.06718723 0 0 0 11.50484808 91.98906777c6.53300375 25.50556257 41.68394495 28.14064038 52.69160883 4.22606766 17.37162448-37.73630017 42.14135425-72.50938081 72.80769204-103.21549295 2.18761121 3.04276886 4.15646224 6.24463696 6.40373557 9.22774369a1871.4375 1871.4375 0 0 0 140.04691725 5.34970492 1866.36093723 1866.36093723 0 0 0 140.04691723-5.34970492c2.24727335-2.98310674 4.21612437-6.18497483 6.3937923-9.2178004 30.66633723 30.70611158 55.4360664 65.4791928 72.80769147 103.21549355 11.00766384 23.91457269 46.15860503 21.27949489 52.69160879-4.22606768a371.15156223 371.15156223 0 0 0 11.514792-91.99901164c0-69.36717486-19.13165746-133.82216804-51.75690182-187.92578088-3.42062944-5.66790279-4.76302748-12.26056868-3.76865837-18.80351632a462.20625001 462.20625001 0 0 0 5.36959269-69.943909c-0.00994388-166.08943902-87.32547796-311.81420293-218.6915546-394.09823051zM605.93803103 357.87693858a93.93749974 93.93749974 0 1 1-187.89594924 6.1e-7 93.93749974 93.93749974 0 0 1 187.89594924-6.1e-7z" p-id="5405" data-v-c6073ba8></path><path d="M429.50777625 765.63860547C429.50777625 803.39355007 466.44236686 1000.39046097 512.00932183 1000.39046097c45.56695499 0 82.4922232-197.00623328 82.5015456-234.7518555 0-37.75494459-36.9345906-68.35043303-82.4922232-68.34111062-45.57627738-0.00932239-82.52019037 30.59548842-82.51086798 68.34111062z" p-id="5406" data-v-c6073ba8></path></svg></div><div class="kanbanniang" data-v-5775ee02><div class="banniang-container" style="display:;" data-v-5775ee02><div class="messageBox" style="right:68px;bottom:190px;display:none;" data-v-5775ee02>
      欢迎来到 星月前端博客
    </div> <div class="operation" style="right:90px;bottom:40px;display:;" data-v-5775ee02><i class="kbnfont kbn-ban-home ban-home" data-v-5775ee02></i> <i class="kbnfont kbn-ban-message message" data-v-5775ee02></i> <i class="kbnfont kbn-ban-close close" data-v-5775ee02></i> <a target="_blank" href="https://vuepress-theme-reco.recoluan.com/views/plugins/kanbanniang.html" data-v-5775ee02><i class="kbnfont kbn-ban-info info" data-v-5775ee02></i></a> <i class="kbnfont kbn-ban-theme skin" style="display:none;" data-v-5775ee02></i></div> <canvas id="banniang" width="150" height="220" class="live2d" style="right:90px;bottom:-20px;opacity:0.9;" data-v-5775ee02></canvas></div> <div class="showBanNiang" style="display:none;" data-v-5775ee02>
    看板娘
  </div></div><canvas id="vuepress-canvas-cursor"></canvas></div></div>
    <script src="/assets/js/app.b0d6e6c9.js" defer></script><script src="/assets/js/3.3f705cf6.js" defer></script><script src="/assets/js/1.5432b32a.js" defer></script><script src="/assets/js/57.a5fde1bb.js" defer></script>
  </body>
</html>
